Centrifugal pipe-mold structure



June 24, 1-930. 4 J. H. UHRIG 1,767,024

CE NTRIFUGAL PIPE MOLD STRUCTURE Filed June 29, 1928 jju/efatoz" Jolt/21L ZllZr/g, 174 My Patented 24, i930 UNITED STATES PATENT OFFICE I JOHN H. UHEIG, OF BEVERLY, NEW JERSEY, ASSIGNOR TO UNITED-STATES CAST IRON PIPE & FOUNDRY COMPANY, OF BURLINGTON, NEW JERSEY, A CORPORATION OF NEWJEBSEY v CENTRIEUGAL PIPE-MOLD STRUCTURE Application Medium: 29, 1928. Serial No. seams.

the life of the mold is not as long as could be desired. It has been proposed to increase the life'of the mold by giving it comparatively thin walls and to stiifen the thin Walled mold by means of a surrounding jacket properly spaced from the mold and supporting it by means of set screws or other interposed supporting means- As heretofore constructed, however, difiiculty has been found in maintaining. and properly circulating the body of water through the supporting jacket and the object of my invention is to provide an improved construction in which an ener etic circulation of water through the jac 'et and in contact with the mold is insured both during the rotation of the jacket and -mold and during the rest periods when they are not rotating.

Broadly speaking, my invention consists in providing a supportin jacket with means, preferably set screws, Ior supporting the mold in the jacket with one or both ends open to the water box and with a series of openings formed through the jacket of such shape as togive ready outlet to the water contained in the jacket during the rotation of the mold and also to facilitate a vertical flow of water into and out of the jacket during the rest periods. Other features of my invention will best be understood as described in connection with the drawings which illustrate a water box mold and jacket constructed in accordance with my invention and in which Figure 1 is a longitudinal central section through the apparatus.

Figure 2, a similar section showing a modification.

Figure 3, a sectional of Fig. 1.

Figure 4, a fragmentary side elevation showing the mold and the open end of the supporting jacket as shown in Fig. 1.

. Figure 5, a cross section on the line 5-5 of Fig. 1, and

view on the line 3-3 Figure 6, a cross section on the line 6'6 of Fig. 1.

A indicates the water box which is of the usual type used in the de Lavaud apparatus,

A and A indicating end walls of the water box. B is a thin walled mold, the ends of which extend through the ends of the water box. C is a driving ring secured to the bell end of the mold, as shown, and provided with gear teeth as indicated at G. D' is the strengthening jacket which is supported on rolls indicated at G and which in turn supportsthe mold by means, as shown, of a multiplicity of set screws, indicated at F, F, etc. As shown in Figure 1, the 'end of the jacket indicated at D opens freely into the water boxand is preferably provided with vanes indicated at E, so set that during the rotation of the mold and sleeve they will tend to draw water in the open end of the sleeve. At D D etc, I have indicated a series of openings formed through the walls of the sleeve, which openings are preferably inclined, as indicated in Fig. 6, in the opposite direction to that of the rotation of the sleeve so that they will tend to expel the water contained in the sleeve.

By preference, I secure one end of the sleeve rmly to oneend of the mold and, in the construction illustrated in Figure 1, I do this by screwing the end of the sleeve indicated at D into the end of the driving ring C, which driving ring is firmly secured to the bell end of the mold.

In the construction illustrated in Figure 2, I have shown the supporting sleeve as open at both ends and provided at both open ends with the directing vanes for inducing flow of water into-the sleeve and in this case the sole connection between the sleeve and the thin walled mold is through the set screws the sleeve is in rapid rotation when the sleeve is rotating, centrifugal force will tend to force the water out through the openings and it is, therefore, quite possible to use radial openings but care must be taken in preparing these openings that they are not inclined in the same direction as that of the rotation of the sleeve as that, for obvious reasons, would tend to prevent the outflow of the water. It will also'be obvious that during the rest periods the water in the water box can and will flow vertically through the openings into the lower openings and out of the upper openings so that a circulation of water in contact with the hot mold is maintained during rest periods as Well as during the rotation of the mold. Having now described my invention, what I claimas new and desire to secure by Letters Patent, is:

s 1. centrifugal pipe mold comprising in combination a mold proper, a strengthening jacket spaced from the mold toaiford a substantial water space, said jacket having an open end for the inflow of water and a series of openings formed through it for the outflow of water during the rotation of the mold and for the vertical flow of water during rest periods and means for aligning the mold in the jacket. 2. A mold structure having the features of claim 1, in which the openings formed through the jacket are inclined in the direction opposite to that in which the mold is rotated to'induce a more energetic outflow of water.

3. A mold structure having the features of claim 1, in which the means for aligning the mold in the jacket consist of a multiplicity of set screws extending through the walls of the jacket and abutted against the mold. j

4. A mold structure having the features of claim 1, in which the jacket is firmly connected to and spaced from the mold at one end and spaced from the mold throughout its unattached length by means of a multiplicity of set screws.

5. A mold structure having the features of claim 1, in which a driving ring is firmly attached to one end of the mold and the strengthening jacket is firmly secured at one end to the end of saidring.

6. In a centrifugal pipe casting machine a water box in combination with a mold, the ends of whichextendthrough the ends of the water box, a strengthening jacket surrounding the mold having an end opening into the water box for the inflow of water and a series of openings throughout its length for the outflow of water during the rotation of the mold and for vertical flow of water during rest periods, roller. supports for the jacket located in the water jacket and a multiplicity of set screws extending through the walls of 8. In combination with a water receptacle forming a water jacket for a pipe mold, a

centrifugal pipe mold the ends of which extend through the walls of the water jacket, a strengthening slcevesurrounding the mold spaced to provide a water space between it and the mold, said sleeve having openings at or near its ends for the free flow of water between it and the water jacket-and one end unattached to the mold or water jacket,

means for attaching the other end of the sleeve to the mold so that they will rotate together and means secured to the sleeve and contacting with the mold without engaging therewith acting to support the mold in the sleeve without preventing relative longitudinal expansion and contraction.

9. Centrifugal p'pe casting apparatus has i ing the features of claim 8,'in which-openings are formed through the walls of the sleeve obliquely inclined in a direction opposite to that ofthe intended rotation of the mold and sleeve.

' JOHN H. UHRIG. 

